Akademik Veri Yönetim Sistemi
SIGMA JOURNAL OF ENGINEERING AND NATURAL SCIENCES, cilt.42, sa.2, ss.366-382, 2024 (ESCI)
In the strength design method, the safety level is tried to be reached by using strength reduction factors ϕ applied to the nominal strengths. In the current ACI 318-19, the safety factors ϕ
are suggested as 0.65 for tie-reinforced concrete columns and 0.60 for plain columns, respectively. The aim of the present study is to evaluate the strength reduction factors of the confined
columns with Carbon Fiber Reinforced Polymer (CFRP) subjected to axial compression load
according to ACI 318-19. For this purpose, a total of 298 column test specimens with circular
and rectangular cross-sections confined with CFRP collected from 18 different experimental studies in the literature were examined to determine the strength reduction factors. The
first-order second-moment approach was used to determine these factors by reliability analysis, and the correlation effects between random variables were not taken into account. The
target reliability index and the corresponding probability of failure were taken as β=3.5 and pF
= 2.33×10-4 for different coefficients of variation of random variables, respectively. Then, these
factors were been separately compared to those of recommended in the ACI 318-19. At the
end of the study, the upper limits of the coefficients of variation that should not be exceeded
were determined to ensure the target reliability of the columns.